Shiru wants to do good deeds every day but wants low risk, high reward.   Then the girls play a game that will change them forever.  Finally, they peak into another word.
Maybe he missed it because he was sick.
Quizás se la perdió porque estaba enfermo.
A lo mejor no pudo ir con los demás porque estaba malo.
Talvez ele tenha faltado
 porque estava doente.